finally on my computer, looked at the nisstec link because it wasnt clickable on my phone
, dont get in coil spacers, they basically do the same thing that the 5100 you already have do, they preload the spring to give lift/horrible ride. you want spacers that go on top of the coilover assembly(use bolts) like the prg ones, if your still set on spacers.
also just looked at your "build" page, with that bumper/winch you totally need coilovers. get rid of those bandaid 5100's
oh yea, if you order from prg, make sure to call him. his prices include shipping, and since we are close he will give you a discount. i saved a couple hundred by calling him